2 * x_tables core - Backend for {ip,ip6,arp}_tables
4 * Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org>
6 * Based on existing ip_tables code which is
7 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
8 * Copyright (C) 2000-2005 Netfilter Core Team <coreteam@netfilter.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
16 #include <linux/kernel.h>
17 #include <linux/socket.h>
18 #include <linux/net.h>
19 #include <linux/proc_fs.h>
20 #include <linux/seq_file.h>
21 #include <linux/string.h>
22 #include <linux/vmalloc.h>
23 #include <linux/mutex.h>
25 #include <net/net_namespace.h>
27 #include <linux/netfilter/x_tables.h>
28 #include <linux/netfilter_arp.h>
31 MODULE_LICENSE("GPL");
32 MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
33 MODULE_DESCRIPTION("{ip,ip6,arp,eb}_tables backend module");
35 #define SMP_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1))
38 struct compat_delta *next;
45 struct list_head match;
46 struct list_head target;
48 struct mutex compat_mutex;
49 struct compat_delta *compat_offsets;
53 static struct xt_af *xt;
55 #ifdef DEBUG_IP_FIREWALL_USER
56 #define duprintf(format, args...) printk(format , ## args)
58 #define duprintf(format, args...)
61 static const char *const xt_prefix[NFPROTO_NUMPROTO] = {
62 [NFPROTO_UNSPEC] = "x",
63 [NFPROTO_IPV4] = "ip",
64 [NFPROTO_ARP] = "arp",
65 [NFPROTO_BRIDGE] = "eb",
66 [NFPROTO_IPV6] = "ip6",
69 /* Registration hooks for targets. */
71 xt_register_target(struct xt_target *target)
73 u_int8_t af = target->family;
76 ret = mutex_lock_interruptible(&xt[af].mutex);
79 list_add(&target->list, &xt[af].target);
80 mutex_unlock(&xt[af].mutex);
83 EXPORT_SYMBOL(xt_register_target);
86 xt_unregister_target(struct xt_target *target)
88 u_int8_t af = target->family;
90 mutex_lock(&xt[af].mutex);
91 list_del(&target->list);
92 mutex_unlock(&xt[af].mutex);
94 EXPORT_SYMBOL(xt_unregister_target);
97 xt_register_targets(struct xt_target *target, unsigned int n)
102 for (i = 0; i < n; i++) {
103 err = xt_register_target(&target[i]);
111 xt_unregister_targets(target, i);
114 EXPORT_SYMBOL(xt_register_targets);
117 xt_unregister_targets(struct xt_target *target, unsigned int n)
121 for (i = 0; i < n; i++)
122 xt_unregister_target(&target[i]);
124 EXPORT_SYMBOL(xt_unregister_targets);
127 xt_register_match(struct xt_match *match)
129 u_int8_t af = match->family;
132 ret = mutex_lock_interruptible(&xt[af].mutex);
136 list_add(&match->list, &xt[af].match);
137 mutex_unlock(&xt[af].mutex);
141 EXPORT_SYMBOL(xt_register_match);
144 xt_unregister_match(struct xt_match *match)
146 u_int8_t af = match->family;
148 mutex_lock(&xt[af].mutex);
149 list_del(&match->list);
150 mutex_unlock(&xt[af].mutex);
152 EXPORT_SYMBOL(xt_unregister_match);
155 xt_register_matches(struct xt_match *match, unsigned int n)
160 for (i = 0; i < n; i++) {
161 err = xt_register_match(&match[i]);
169 xt_unregister_matches(match, i);
172 EXPORT_SYMBOL(xt_register_matches);
175 xt_unregister_matches(struct xt_match *match, unsigned int n)
179 for (i = 0; i < n; i++)
180 xt_unregister_match(&match[i]);
182 EXPORT_SYMBOL(xt_unregister_matches);
186 * These are weird, but module loading must not be done with mutex
187 * held (since they will register), and we have to have a single
188 * function to use try_then_request_module().
191 /* Find match, grabs ref. Returns ERR_PTR() on error. */
192 struct xt_match *xt_find_match(u8 af, const char *name, u8 revision)
197 if (mutex_lock_interruptible(&xt[af].mutex) != 0)
198 return ERR_PTR(-EINTR);
200 list_for_each_entry(m, &xt[af].match, list) {
201 if (strcmp(m->name, name) == 0) {
202 if (m->revision == revision) {
203 if (try_module_get(m->me)) {
204 mutex_unlock(&xt[af].mutex);
208 err = -EPROTOTYPE; /* Found something. */
211 mutex_unlock(&xt[af].mutex);
213 if (af != NFPROTO_UNSPEC)
214 /* Try searching again in the family-independent list */
215 return xt_find_match(NFPROTO_UNSPEC, name, revision);
219 EXPORT_SYMBOL(xt_find_match);
221 /* Find target, grabs ref. Returns ERR_PTR() on error. */
222 struct xt_target *xt_find_target(u8 af, const char *name, u8 revision)
227 if (mutex_lock_interruptible(&xt[af].mutex) != 0)
228 return ERR_PTR(-EINTR);
230 list_for_each_entry(t, &xt[af].target, list) {
231 if (strcmp(t->name, name) == 0) {
232 if (t->revision == revision) {
233 if (try_module_get(t->me)) {
234 mutex_unlock(&xt[af].mutex);
238 err = -EPROTOTYPE; /* Found something. */
241 mutex_unlock(&xt[af].mutex);
243 if (af != NFPROTO_UNSPEC)
244 /* Try searching again in the family-independent list */
245 return xt_find_target(NFPROTO_UNSPEC, name, revision);
249 EXPORT_SYMBOL(xt_find_target);
251 struct xt_target *xt_request_find_target(u8 af, const char *name, u8 revision)
253 struct xt_target *target;
255 target = try_then_request_module(xt_find_target(af, name, revision),
256 "%st_%s", xt_prefix[af], name);
257 if (IS_ERR(target) || !target)
261 EXPORT_SYMBOL_GPL(xt_request_find_target);
263 static int match_revfn(u8 af, const char *name, u8 revision, int *bestp)
265 const struct xt_match *m;
268 list_for_each_entry(m, &xt[af].match, list) {
269 if (strcmp(m->name, name) == 0) {
270 if (m->revision > *bestp)
271 *bestp = m->revision;
272 if (m->revision == revision)
279 static int target_revfn(u8 af, const char *name, u8 revision, int *bestp)
281 const struct xt_target *t;
284 list_for_each_entry(t, &xt[af].target, list) {
285 if (strcmp(t->name, name) == 0) {
286 if (t->revision > *bestp)
287 *bestp = t->revision;
288 if (t->revision == revision)
295 /* Returns true or false (if no such extension at all) */
296 int xt_find_revision(u8 af, const char *name, u8 revision, int target,
299 int have_rev, best = -1;
301 if (mutex_lock_interruptible(&xt[af].mutex) != 0) {
306 have_rev = target_revfn(af, name, revision, &best);
308 have_rev = match_revfn(af, name, revision, &best);
309 mutex_unlock(&xt[af].mutex);
311 /* Nothing at all? Return 0 to try loading module. */
319 *err = -EPROTONOSUPPORT;
322 EXPORT_SYMBOL_GPL(xt_find_revision);
324 int xt_check_match(const struct xt_match *match, unsigned short family,
325 unsigned int size, const char *table, unsigned int hook_mask,
326 unsigned short proto, int inv_proto)
328 if (XT_ALIGN(match->matchsize) != size &&
329 match->matchsize != -1) {
331 * ebt_among is exempt from centralized matchsize checking
332 * because it uses a dynamic-size data set.
334 printk("%s_tables: %s match: invalid size %Zu != %u\n",
335 xt_prefix[family], match->name,
336 XT_ALIGN(match->matchsize), size);
339 if (match->table && strcmp(match->table, table)) {
340 printk("%s_tables: %s match: only valid in %s table, not %s\n",
341 xt_prefix[family], match->name, match->table, table);
344 if (match->hooks && (hook_mask & ~match->hooks) != 0) {
345 printk("%s_tables: %s match: bad hook_mask %u/%u\n",
346 xt_prefix[family], match->name, hook_mask, match->hooks);
349 if (match->proto && (match->proto != proto || inv_proto)) {
350 printk("%s_tables: %s match: only valid for protocol %u\n",
351 xt_prefix[family], match->name, match->proto);
356 EXPORT_SYMBOL_GPL(xt_check_match);
359 int xt_compat_add_offset(u_int8_t af, unsigned int offset, short delta)
361 struct compat_delta *tmp;
363 tmp = kmalloc(sizeof(struct compat_delta), GFP_KERNEL);
367 tmp->offset = offset;
370 if (xt[af].compat_offsets) {
371 tmp->next = xt[af].compat_offsets->next;
372 xt[af].compat_offsets->next = tmp;
374 xt[af].compat_offsets = tmp;
379 EXPORT_SYMBOL_GPL(xt_compat_add_offset);
381 void xt_compat_flush_offsets(u_int8_t af)
383 struct compat_delta *tmp, *next;
385 if (xt[af].compat_offsets) {
386 for (tmp = xt[af].compat_offsets; tmp; tmp = next) {
390 xt[af].compat_offsets = NULL;
393 EXPORT_SYMBOL_GPL(xt_compat_flush_offsets);
395 short xt_compat_calc_jump(u_int8_t af, unsigned int offset)
397 struct compat_delta *tmp;
400 for (tmp = xt[af].compat_offsets, delta = 0; tmp; tmp = tmp->next)
401 if (tmp->offset < offset)
405 EXPORT_SYMBOL_GPL(xt_compat_calc_jump);
407 int xt_compat_match_offset(const struct xt_match *match)
409 u_int16_t csize = match->compatsize ? : match->matchsize;
410 return XT_ALIGN(match->matchsize) - COMPAT_XT_ALIGN(csize);
412 EXPORT_SYMBOL_GPL(xt_compat_match_offset);
414 int xt_compat_match_from_user(struct xt_entry_match *m, void **dstptr,
417 const struct xt_match *match = m->u.kernel.match;
418 struct compat_xt_entry_match *cm = (struct compat_xt_entry_match *)m;
419 int pad, off = xt_compat_match_offset(match);
420 u_int16_t msize = cm->u.user.match_size;
423 memcpy(m, cm, sizeof(*cm));
424 if (match->compat_from_user)
425 match->compat_from_user(m->data, cm->data);
427 memcpy(m->data, cm->data, msize - sizeof(*cm));
428 pad = XT_ALIGN(match->matchsize) - match->matchsize;
430 memset(m->data + match->matchsize, 0, pad);
433 m->u.user.match_size = msize;
439 EXPORT_SYMBOL_GPL(xt_compat_match_from_user);
441 int xt_compat_match_to_user(struct xt_entry_match *m, void __user **dstptr,
444 const struct xt_match *match = m->u.kernel.match;
445 struct compat_xt_entry_match __user *cm = *dstptr;
446 int off = xt_compat_match_offset(match);
447 u_int16_t msize = m->u.user.match_size - off;
449 if (copy_to_user(cm, m, sizeof(*cm)) ||
450 put_user(msize, &cm->u.user.match_size) ||
451 copy_to_user(cm->u.user.name, m->u.kernel.match->name,
452 strlen(m->u.kernel.match->name) + 1))
455 if (match->compat_to_user) {
456 if (match->compat_to_user((void __user *)cm->data, m->data))
459 if (copy_to_user(cm->data, m->data, msize - sizeof(*cm)))
467 EXPORT_SYMBOL_GPL(xt_compat_match_to_user);
468 #endif /* CONFIG_COMPAT */
470 int xt_check_target(const struct xt_target *target, unsigned short family,
471 unsigned int size, const char *table, unsigned int hook_mask,
472 unsigned short proto, int inv_proto)
474 if (XT_ALIGN(target->targetsize) != size) {
475 printk("%s_tables: %s target: invalid size %Zu != %u\n",
476 xt_prefix[family], target->name,
477 XT_ALIGN(target->targetsize), size);
480 if (target->table && strcmp(target->table, table)) {
481 printk("%s_tables: %s target: only valid in %s table, not %s\n",
482 xt_prefix[family], target->name, target->table, table);
485 if (target->hooks && (hook_mask & ~target->hooks) != 0) {
486 printk("%s_tables: %s target: bad hook_mask %u/%u\n",
487 xt_prefix[family], target->name, hook_mask,
491 if (target->proto && (target->proto != proto || inv_proto)) {
492 printk("%s_tables: %s target: only valid for protocol %u\n",
493 xt_prefix[family], target->name, target->proto);
498 EXPORT_SYMBOL_GPL(xt_check_target);
501 int xt_compat_target_offset(const struct xt_target *target)
503 u_int16_t csize = target->compatsize ? : target->targetsize;
504 return XT_ALIGN(target->targetsize) - COMPAT_XT_ALIGN(csize);
506 EXPORT_SYMBOL_GPL(xt_compat_target_offset);
508 void xt_compat_target_from_user(struct xt_entry_target *t, void **dstptr,
511 const struct xt_target *target = t->u.kernel.target;
512 struct compat_xt_entry_target *ct = (struct compat_xt_entry_target *)t;
513 int pad, off = xt_compat_target_offset(target);
514 u_int16_t tsize = ct->u.user.target_size;
517 memcpy(t, ct, sizeof(*ct));
518 if (target->compat_from_user)
519 target->compat_from_user(t->data, ct->data);
521 memcpy(t->data, ct->data, tsize - sizeof(*ct));
522 pad = XT_ALIGN(target->targetsize) - target->targetsize;
524 memset(t->data + target->targetsize, 0, pad);
527 t->u.user.target_size = tsize;
532 EXPORT_SYMBOL_GPL(xt_compat_target_from_user);
534 int xt_compat_target_to_user(struct xt_entry_target *t, void __user **dstptr,
537 const struct xt_target *target = t->u.kernel.target;
538 struct compat_xt_entry_target __user *ct = *dstptr;
539 int off = xt_compat_target_offset(target);
540 u_int16_t tsize = t->u.user.target_size - off;
542 if (copy_to_user(ct, t, sizeof(*ct)) ||
543 put_user(tsize, &ct->u.user.target_size) ||
544 copy_to_user(ct->u.user.name, t->u.kernel.target->name,
545 strlen(t->u.kernel.target->name) + 1))
548 if (target->compat_to_user) {
549 if (target->compat_to_user((void __user *)ct->data, t->data))
552 if (copy_to_user(ct->data, t->data, tsize - sizeof(*ct)))
560 EXPORT_SYMBOL_GPL(xt_compat_target_to_user);
563 struct xt_table_info *xt_alloc_table_info(unsigned int size)
565 struct xt_table_info *newinfo;
568 /* Pedantry: prevent them from hitting BUG() in vmalloc.c --RR */
569 if ((SMP_ALIGN(size) >> PAGE_SHIFT) + 2 > num_physpages)
572 newinfo = kzalloc(XT_TABLE_INFO_SZ, GFP_KERNEL);
576 newinfo->size = size;
578 for_each_possible_cpu(cpu) {
579 if (size <= PAGE_SIZE)
580 newinfo->entries[cpu] = kmalloc_node(size,
584 newinfo->entries[cpu] = vmalloc_node(size,
587 if (newinfo->entries[cpu] == NULL) {
588 xt_free_table_info(newinfo);
595 EXPORT_SYMBOL(xt_alloc_table_info);
597 void xt_free_table_info(struct xt_table_info *info)
601 for_each_possible_cpu(cpu) {
602 if (info->size <= PAGE_SIZE)
603 kfree(info->entries[cpu]);
605 vfree(info->entries[cpu]);
609 EXPORT_SYMBOL(xt_free_table_info);
611 /* Find table by name, grabs mutex & ref. Returns ERR_PTR() on error. */
612 struct xt_table *xt_find_table_lock(struct net *net, u_int8_t af,
617 if (mutex_lock_interruptible(&xt[af].mutex) != 0)
618 return ERR_PTR(-EINTR);
620 list_for_each_entry(t, &net->xt.tables[af], list)
621 if (strcmp(t->name, name) == 0 && try_module_get(t->me))
623 mutex_unlock(&xt[af].mutex);
626 EXPORT_SYMBOL_GPL(xt_find_table_lock);
628 void xt_table_unlock(struct xt_table *table)
630 mutex_unlock(&xt[table->af].mutex);
632 EXPORT_SYMBOL_GPL(xt_table_unlock);
635 void xt_compat_lock(u_int8_t af)
637 mutex_lock(&xt[af].compat_mutex);
639 EXPORT_SYMBOL_GPL(xt_compat_lock);
641 void xt_compat_unlock(u_int8_t af)
643 mutex_unlock(&xt[af].compat_mutex);
645 EXPORT_SYMBOL_GPL(xt_compat_unlock);
648 struct xt_table_info *
649 xt_replace_table(struct xt_table *table,
650 unsigned int num_counters,
651 struct xt_table_info *newinfo,
654 struct xt_table_info *oldinfo, *private;
656 /* Do the substitution. */
657 write_lock_bh(&table->lock);
658 private = table->private;
659 /* Check inside lock: is the old number correct? */
660 if (num_counters != private->number) {
661 duprintf("num_counters != table->private->number (%u/%u)\n",
662 num_counters, private->number);
663 write_unlock_bh(&table->lock);
668 table->private = newinfo;
669 newinfo->initial_entries = oldinfo->initial_entries;
670 write_unlock_bh(&table->lock);
674 EXPORT_SYMBOL_GPL(xt_replace_table);
676 struct xt_table *xt_register_table(struct net *net, struct xt_table *table,
677 struct xt_table_info *bootstrap,
678 struct xt_table_info *newinfo)
681 struct xt_table_info *private;
684 /* Don't add one object to multiple lists. */
685 table = kmemdup(table, sizeof(struct xt_table), GFP_KERNEL);
691 ret = mutex_lock_interruptible(&xt[table->af].mutex);
695 /* Don't autoload: we'd eat our tail... */
696 list_for_each_entry(t, &net->xt.tables[table->af], list) {
697 if (strcmp(t->name, table->name) == 0) {
703 /* Simplifies replace_table code. */
704 table->private = bootstrap;
705 rwlock_init(&table->lock);
706 if (!xt_replace_table(table, 0, newinfo, &ret))
709 private = table->private;
710 duprintf("table->private->number = %u\n", private->number);
712 /* save number of initial entries */
713 private->initial_entries = private->number;
715 list_add(&table->list, &net->xt.tables[table->af]);
716 mutex_unlock(&xt[table->af].mutex);
720 mutex_unlock(&xt[table->af].mutex);
726 EXPORT_SYMBOL_GPL(xt_register_table);
728 void *xt_unregister_table(struct xt_table *table)
730 struct xt_table_info *private;
732 mutex_lock(&xt[table->af].mutex);
733 private = table->private;
734 list_del(&table->list);
735 mutex_unlock(&xt[table->af].mutex);
740 EXPORT_SYMBOL_GPL(xt_unregister_table);
742 #ifdef CONFIG_PROC_FS
743 struct xt_names_priv {
744 struct seq_net_private p;
747 static void *xt_table_seq_start(struct seq_file *seq, loff_t *pos)
749 struct xt_names_priv *priv = seq->private;
750 struct net *net = seq_file_net(seq);
751 u_int8_t af = priv->af;
753 mutex_lock(&xt[af].mutex);
754 return seq_list_start(&net->xt.tables[af], *pos);
757 static void *xt_table_seq_next(struct seq_file *seq, void *v, loff_t *pos)
759 struct xt_names_priv *priv = seq->private;
760 struct net *net = seq_file_net(seq);
761 u_int8_t af = priv->af;
763 return seq_list_next(v, &net->xt.tables[af], pos);
766 static void xt_table_seq_stop(struct seq_file *seq, void *v)
768 struct xt_names_priv *priv = seq->private;
769 u_int8_t af = priv->af;
771 mutex_unlock(&xt[af].mutex);
774 static int xt_table_seq_show(struct seq_file *seq, void *v)
776 struct xt_table *table = list_entry(v, struct xt_table, list);
778 if (strlen(table->name))
779 return seq_printf(seq, "%s\n", table->name);
784 static const struct seq_operations xt_table_seq_ops = {
785 .start = xt_table_seq_start,
786 .next = xt_table_seq_next,
787 .stop = xt_table_seq_stop,
788 .show = xt_table_seq_show,
791 static int xt_table_open(struct inode *inode, struct file *file)
794 struct xt_names_priv *priv;
796 ret = seq_open_net(inode, file, &xt_table_seq_ops,
797 sizeof(struct xt_names_priv));
799 priv = ((struct seq_file *)file->private_data)->private;
800 priv->af = (unsigned long)PDE(inode)->data;
805 static const struct file_operations xt_table_ops = {
806 .owner = THIS_MODULE,
807 .open = xt_table_open,
810 .release = seq_release_net,
813 static void *xt_match_seq_start(struct seq_file *seq, loff_t *pos)
815 struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;
816 u_int16_t af = (unsigned long)pde->data;
818 mutex_lock(&xt[af].mutex);
819 return seq_list_start(&xt[af].match, *pos);
822 static void *xt_match_seq_next(struct seq_file *seq, void *v, loff_t *pos)
824 struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;
825 u_int16_t af = (unsigned long)pde->data;
827 return seq_list_next(v, &xt[af].match, pos);
830 static void xt_match_seq_stop(struct seq_file *seq, void *v)
832 struct proc_dir_entry *pde = seq->private;
833 u_int16_t af = (unsigned long)pde->data;
835 mutex_unlock(&xt[af].mutex);
838 static int xt_match_seq_show(struct seq_file *seq, void *v)
840 struct xt_match *match = list_entry(v, struct xt_match, list);
842 if (strlen(match->name))
843 return seq_printf(seq, "%s\n", match->name);
848 static const struct seq_operations xt_match_seq_ops = {
849 .start = xt_match_seq_start,
850 .next = xt_match_seq_next,
851 .stop = xt_match_seq_stop,
852 .show = xt_match_seq_show,
855 static int xt_match_open(struct inode *inode, struct file *file)
859 ret = seq_open(file, &xt_match_seq_ops);
861 struct seq_file *seq = file->private_data;
863 seq->private = PDE(inode);
868 static const struct file_operations xt_match_ops = {
869 .owner = THIS_MODULE,
870 .open = xt_match_open,
873 .release = seq_release,
876 static void *xt_target_seq_start(struct seq_file *seq, loff_t *pos)
878 struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;
879 u_int16_t af = (unsigned long)pde->data;
881 mutex_lock(&xt[af].mutex);
882 return seq_list_start(&xt[af].target, *pos);
885 static void *xt_target_seq_next(struct seq_file *seq, void *v, loff_t *pos)
887 struct proc_dir_entry *pde = (struct proc_dir_entry *)seq->private;
888 u_int16_t af = (unsigned long)pde->data;
890 return seq_list_next(v, &xt[af].target, pos);
893 static void xt_target_seq_stop(struct seq_file *seq, void *v)
895 struct proc_dir_entry *pde = seq->private;
896 u_int16_t af = (unsigned long)pde->data;
898 mutex_unlock(&xt[af].mutex);
901 static int xt_target_seq_show(struct seq_file *seq, void *v)
903 struct xt_target *target = list_entry(v, struct xt_target, list);
905 if (strlen(target->name))
906 return seq_printf(seq, "%s\n", target->name);
911 static const struct seq_operations xt_target_seq_ops = {
912 .start = xt_target_seq_start,
913 .next = xt_target_seq_next,
914 .stop = xt_target_seq_stop,
915 .show = xt_target_seq_show,
918 static int xt_target_open(struct inode *inode, struct file *file)
922 ret = seq_open(file, &xt_target_seq_ops);
924 struct seq_file *seq = file->private_data;
926 seq->private = PDE(inode);
931 static const struct file_operations xt_target_ops = {
932 .owner = THIS_MODULE,
933 .open = xt_target_open,
936 .release = seq_release,
939 #define FORMAT_TABLES "_tables_names"
940 #define FORMAT_MATCHES "_tables_matches"
941 #define FORMAT_TARGETS "_tables_targets"
943 #endif /* CONFIG_PROC_FS */
945 int xt_proto_init(struct net *net, u_int8_t af)
947 #ifdef CONFIG_PROC_FS
948 char buf[XT_FUNCTION_MAXNAMELEN];
949 struct proc_dir_entry *proc;
952 if (af >= ARRAY_SIZE(xt_prefix))
956 #ifdef CONFIG_PROC_FS
957 strlcpy(buf, xt_prefix[af], sizeof(buf));
958 strlcat(buf, FORMAT_TABLES, sizeof(buf));
959 proc = proc_create_data(buf, 0440, net->proc_net, &xt_table_ops,
960 (void *)(unsigned long)af);
964 strlcpy(buf, xt_prefix[af], sizeof(buf));
965 strlcat(buf, FORMAT_MATCHES, sizeof(buf));
966 proc = proc_create_data(buf, 0440, net->proc_net, &xt_match_ops,
967 (void *)(unsigned long)af);
969 goto out_remove_tables;
971 strlcpy(buf, xt_prefix[af], sizeof(buf));
972 strlcat(buf, FORMAT_TARGETS, sizeof(buf));
973 proc = proc_create_data(buf, 0440, net->proc_net, &xt_target_ops,
974 (void *)(unsigned long)af);
976 goto out_remove_matches;
981 #ifdef CONFIG_PROC_FS
983 strlcpy(buf, xt_prefix[af], sizeof(buf));
984 strlcat(buf, FORMAT_MATCHES, sizeof(buf));
985 proc_net_remove(net, buf);
988 strlcpy(buf, xt_prefix[af], sizeof(buf));
989 strlcat(buf, FORMAT_TABLES, sizeof(buf));
990 proc_net_remove(net, buf);
995 EXPORT_SYMBOL_GPL(xt_proto_init);
997 void xt_proto_fini(struct net *net, u_int8_t af)
999 #ifdef CONFIG_PROC_FS
1000 char buf[XT_FUNCTION_MAXNAMELEN];
1002 strlcpy(buf, xt_prefix[af], sizeof(buf));
1003 strlcat(buf, FORMAT_TABLES, sizeof(buf));
1004 proc_net_remove(net, buf);
1006 strlcpy(buf, xt_prefix[af], sizeof(buf));
1007 strlcat(buf, FORMAT_TARGETS, sizeof(buf));
1008 proc_net_remove(net, buf);
1010 strlcpy(buf, xt_prefix[af], sizeof(buf));
1011 strlcat(buf, FORMAT_MATCHES, sizeof(buf));
1012 proc_net_remove(net, buf);
1013 #endif /*CONFIG_PROC_FS*/
1015 EXPORT_SYMBOL_GPL(xt_proto_fini);
1017 static int __net_init xt_net_init(struct net *net)
1021 for (i = 0; i < NFPROTO_NUMPROTO; i++)
1022 INIT_LIST_HEAD(&net->xt.tables[i]);
1026 static struct pernet_operations xt_net_ops = {
1027 .init = xt_net_init,
1030 static int __init xt_init(void)
1034 xt = kmalloc(sizeof(struct xt_af) * NFPROTO_NUMPROTO, GFP_KERNEL);
1038 for (i = 0; i < NFPROTO_NUMPROTO; i++) {
1039 mutex_init(&xt[i].mutex);
1040 #ifdef CONFIG_COMPAT
1041 mutex_init(&xt[i].compat_mutex);
1042 xt[i].compat_offsets = NULL;
1044 INIT_LIST_HEAD(&xt[i].target);
1045 INIT_LIST_HEAD(&xt[i].match);
1047 rv = register_pernet_subsys(&xt_net_ops);
1053 static void __exit xt_fini(void)
1055 unregister_pernet_subsys(&xt_net_ops);
1059 module_init(xt_init);
1060 module_exit(xt_fini);